FI58828B - FRAMSTAELLT FRAMSTAELLT SKYDDSHOELJE FOER ROERKROEKAR - Google Patents

Description

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(41) Interpreters Stuck - Bllvlt offuntllf 02.09.7U

Patent. ) · Register board hmmu *** date of date

Patent · och registerstyrelsen 7 Anseksn utta | d och utUkrifun publicend 31.12.80 (32) (33) (31) Pyydetty etuoilcu »—Buglrd prtoritet 01.03-73

Sweden-Sverige (SE) 73-2888 / 8 (71) Isoleringsaktiebolaget ISENTA, Radiatorvägen 5, Örebro,

Sweden-Sweden (SE) (72) Frans Gunnar Seved Andersson, Djärved, Sweden-Sweden (SE) (7U) Berggren Oy Ab (5U) Deep-drawn casing for pipe pipes -Genom djupdragning framställt skyddshölje för rörkrökar

The invention relates to a deep-drawn sheath for a pipe bend which, in its rest position, in which it is not placed on the pipe bend, has a shuttle-shaped cross-section, while in its click-operated operating position, in which it is placed on the pipe bend, it is bent around the pipe bend.

It is known to manufacture protective sheaths of the type mentioned above, the free edges of which are in the same plane when the sheath is in its rest position before it is placed on the pipe bend.

The reason for wanting to fit such shields to pipe bends is that very cold or very hot medium often flows in the pipes, which should be protected from heat exchange with the environment so that the temperature of the medium does not change. For this purpose, it has been customary to insulate the pipe with an insulating material which has usually been cup-shaped in cross-section. This can be made of mineral wool, expanded plastic or other good insulating material. However, all of these insulation materials are 2,582,88 very sensitive to external influences.

Wires of the type in question are often located on the roof or near walls in cramped spaces such as basements, boiler rooms, corridors, ship bottlenecks, etc. Because wires are installed in such places, especially if heavy or clumped objects are transported in the same places, insulation is easily damaged. For this reason, it has been proposed to surround the insulation with a plastic or sheet metal sheath.

Such sheaths can be easily placed on straight pipe sections, but there have been difficulties in insulating pipe bends. For this reason, the deep-drawn protective sheaths mentioned above have been proposed.

For practical reasons, deep drawing always starts from the planar plastic sheet from which the deep drawn piece is made, and this must thus be placed on a planar frame with a cavity which can be either exposed to compressed air on one side or vacuum under one side, when the plastic sheet is heated to a plastic space and a pressure difference is created, the plastic sheet deforms into the same shape as the inside of the cavity that was inside the frame. As a result, all deep-drawn objects will, by their nature, be uniform at their free edges in a single plane, namely in the plane in which the plastic sheet was originally placed. If the casing has to be adapted for a pipe bend, the free edge of the casing must be as uniform as possible and in the rest position in a single plane, thus avoiding clean-cutting in the manufacture of the casing. Such a procedure has also proved possible, but unfortunately this sheath will then only fit into the pipe bend according to the given dimension. The dimensioning of the pipe bend is then determined, on the one hand, by the pipe's own outer diameter and, on the other hand, also by the radius of curvature of the pipe bend.

In order to be able to install pipes in all different situations, it has been practically a troll to make different bends for each separate pipe dimensioning, which differ in the radius of curvature. If you have to make your own insulation and sheaths for all such pipe bends of different sizes, then such a large number of shields will be created that their use will become uneconomical.

The object of the invention is to provide an economically protective sheath which can be used for pipe bends of the same size, the radii of curvature of which are considerably different.

This is advantageously achieved by a protective sheath according to the invention, characterized in that in the rest position of the sheath the concave, coplanar edge lines delimit the ends, the edge of the ends is raised above this plane towards the other parts of the sheath. is a shape which forms a section line perpendicular to the radial plane of the pipe bend opposite the plane of curvature of the pipe bend, and that the jacket in the pipe-bend operating position has an outer bend radius whose center in the plane of the pipe bend is outside the inner bend radius. Unfortunately, it has been found that such a sheath cannot be made in such a way that the uniform free edges of the sheath in the rest position of the sheath are in a single plane. Thus, a special work step is required to clean the upper edge, which must no longer be planar, so that a protective jacket of the above-mentioned quality can be used for pipe bends with different radii of curvature. This extra work step naturally increases manufacturing costs, but this drawback is largely offset by the economic benefits it provides. In that case, it is not necessary to maintain a large stock of protective sheaths, most of which would probably be relatively small in size. The invention provides a protective sheath which can be placed on pipe bends having different radii of curvature and which can be manufactured in an economically advantageous manner.

The invention will now be described in more detail with reference to an application example shown in the accompanying drawings, but the invention is not limited to this particular application example, and modifications may occur within the scope of the claims.

4 58828

In the drawings, Figures 1 and 2 show two different insulated pipe bends with older sheaths, while Figures 3, 4 and 5 show a blank immediately after deep drawing but before a cut cut for use in a pipe bend according to the present invention. Fig. 3 shows the protective cover in its rest position from the side and perpendicular to its longitudinal direction, Fig. 4 shows the protective cover from above and Fig. 5 shows the protective cover in the transverse direction. Figures 6, 7 and 8 show the protective jacket after cutting, respectively. Figures 9 and 10 show the protective jacket after cutting, respectively. Finally, Figures 9 and 10 show the sheath in two different directions perpendicular to each other and illustrate what the sheath will look like after it has been clicked over the pipe bend. Figures 3-10 are drawn to the same scale.

Figures 1 and 2 thus show two pipe bends 10 'and 10 ", which form the extreme cases of the different bending radii that can occur in pipe bends when the pipe dimension is equal. The pipe bend of Figure 1 thus has a substantially much larger bending radius determined by the center 11' , while the pipe bend according to Fig. 2 has a considerably smaller radius of curvature determined by the curvature center 11 ". In both cases, the pipe bend is provided with insulation, for example of mineral wool 12 ', 12 "and a sheath 13', 13".

It will be immediately apparent from Figures 1 and 2 that there must be different shields for all the radii of curvature between the cases shown therein if the technique underlying both figures is applied. In this context, it can be mentioned that standard pipe bends for a certain coarse pipe dimensioning require five different radii of curvature. Figure 1 shows the largest of these curvature radii, while Figure 2 shows the smallest, but there are also three curvature radii between the two, which would make it necessary to use five different shapes of sheath for the pipe dimension in question.

58828

According to the invention, it is intended to arrange the sheath for the pipe bend so that this sheath can be placed both on the pipe bend shown in Fig. 1 and on the pipe bend shown in Fig. 2. The sheath around the pipe bend, the pipe bend being surrounded by insulation, therefore be an outer contour corresponding to that shown in Figure 2, but an inner contour corresponding to that shown in Figure 1. As a result, although a certain space is allowed between the shield on the one hand and the insulation on the other, such a shield can protect the insulation in each of the five different pipe bends mentioned above, which occur within the same pipe dimensioning.

As mentioned above, it is then no longer possible to arrange so that the free, uniform edges of the cover in the rest position of the cover are in the same plane. Therefore, they are forced to manufacture the sheath in two different stages, namely the first stage during deep drawing and the second stage during clean-cutting.

Figure 3 shows the sheath 14, viewed perpendicular to the longitudinal direction of the sheath, immediately after deep drawing. The deep drawing has thus left a free edge 15 which is in a single plane. Above this basic plane there is thus the actual cup-shaped part 16 as well as both jug-shaped parts 17 'and 17 ". Figure 4 shows the cross-sectional ends 18' and 18" of the jacket.

The post-cut shape of the lower edge of this sheath shown in Figures 3-5 is shown in Figures 6-8. In practice, this means that the edge part 19, delimited by the contour 20, is cut off from both outer long sides of the cover, whereas in contrast such clean-cutting is not performed in the jug-shaped parts 17 'and 17 ". 22 ", which is in the same plane as the aforementioned plane 15, while the outer sides of the cover jacket are delimited by arcuate raised intermediate portions 20 ', 20".

6 58828

When installing the sheath according to the present invention, the procedure is such that the sheath, see Fig. 7, is placed against the outside of the pipe bend, whereby the plane of the pipe bend must be vertical with respect to Fig. 7. The two jaw-shaped parts 17 ', 17 "are then turned around the tube, and then snap together as shown in Fig. 9 so that they meet each other along the inner line of the protective jacket.

In the embodiment shown in Figures 3-10, the protective sheath is further extended to provide, on the one hand, an overlap seam 22 at the point where the edges 17 'and 17 "of the jaw-shaped parts meet each other and, on the other hand, extensions 23 intended to cover normally straight connecting parts. which are at each end of the pipe bend.

Fig. 10 also shows those centers of curvature which, shown in a large schematic form, are shown in Figs. 1 and 2 by reference numerals 11 'and 11 ".

Although the protective sheath of the type in question closes very well around the tube with its own snap-on capability, it is nevertheless important that both overlapping parts in the overlapping seam 22 can be made to press tightly against each other. It has been found that this can be easily accomplished either by tying or using tape covering the free outer edge of the overlap seam 22.

Claims (5)

7 58828 A deep-drawn sheath (14) for a pipe bend, which in its rest position, where it is not placed on the pipe bend, is in the form of a shuttle with a cross-sectional pressure (18 ', 18 "), while it snaps into its operative position in which it is placed on the pipe bend. , is the shape of a bent pipe surrounding a pipe bend, characterized in that in the rest position of the jacket the concave, flush edge lines (21 ', 21 ") delimit the ends (17', 17") and the intermediate parts of the ends (17 ', 17 ") ( 20 ', 20 ") the edge is raised above this plane towards the other parts of the jacket, that said intermediate portions (20', 20") of the edge in the operative position placed on the jacket pipe bend have a shape forming a section line perpendicular to the plane of curvature of the pipe bend; the jacket in the operating position on the pipe bend has an outer curvature radius, the center (11 ") of which in the plane of the pipe bend is outside the inner curvature radius (11 '). Protective jacket according to Claim 1, characterized in that the raised intermediate parts (20 ', 20 ") are extended in such a way that, in the operative position of the jacket, they form part of the straight end portions (23) normally in connection with the pipe bends. Protective jacket according to Claim 1 or 2, characterized in that the concave edges (21 ', 21 ") of the end parts (17', 17") are extended so that they form a longitudinal seam (22) in the operative position of the jacket's pipe bend. 1. The genome of the circulating shield (14) for a rotary shield, in which case it is applied to the sheaves, in the form of a coil with a spindle (18 ', 18 "), the shield of the shoulder is intact the headforms are applied in the form of a cross-section, the headforms of the headforms (17 ', 17 ") and the headforms of the headforms (21', 21") are soon to be removed, the square head (17 ', 17 ") is attached to the side (20', 21") and is soon extended to the side of the body, (20 ', 20 ") to the side (20', 20") aktiva, pä en rörkrök applicerade läge, har en form som utgör en skärningslinje i ett radialplan